Just for my education, can you maybe elaborate on using the "implement an IndexReader that delivers a synthetic index" approach?
IndexReader is an abstract class. It has few data fields, and few non-static methods that are not implemented in terms of abstract methods. So, in effect, it is an interface.
When Lucene indexes a token stream it creates a single-document index that is then merged with other single- and multi-document indexes to form an index that is searched. You could bypass the first step of this (indexing a token stream) by instead directly implementing all of IndexReader's abstract methods to return the same thing as the single-document index that Lucene would create. This would be marginally faster, as no Token objects would be created at all. But, since IndexReader has a lot of abstract methods, it would be a lot of work. I didn't really mean it as a practical suggestion.
Doug
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